The resulting
nanoparticles were obtained by centrifugation (8500 rpm, 10 min)
and washed with methanol several times before vacuum drying.
The
extraction of CTAB resided in the nanoparticles was carried out in a
mixture of methanol and HCl (16:1 v/v) for 48 h at 60 °C. MSN-NH2
nanoparticles were obtained after centrifugation (8500 rpm, 10 min),
washing with methanol (four times) and vacuum drying.